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HATs meet structural biology.

Josep Rullo-Tubau1, Paola Bartoccioni2, Oscar Llorca3

  • 1Institute for Research in Biomedicine, The Barcelona Institute of Science and Technology (BIST), Baldiri I Reixac 10, E-08028, Barcelona, Spain.

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Summary

Heteromeric amino acid transporters (HATs) are crucial for human health. Recent structural studies reveal their transport mechanisms, substrate specificity, and how mutations affect function, offering insights into rare diseases and cancer.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Membrane Transport
  • Structural Biology

Background:

  • Heteromeric amino acid transporters (HATs) represent a key class of amino acid transport systems in humans.
  • Their involvement in rare diseases, complex conditions, and cancer is increasingly recognized.
  • Recent advancements include the atomic-level resolution of human HAT structures and their bacterial counterparts.

Purpose of the Study:

  • To elucidate the molecular mechanisms of HAT function.
  • To understand the basis of substrate specificity and binding asymmetry in HATs.
  • To investigate the functional and biogenic consequences of disease-associated mutations in HATs.

Main Methods:

  • X-ray crystallography and cryo-electron microscopy for structural determination.
  • Biochemical assays to study substrate transport and binding kinetics.
  • Computational modeling to analyze transporter dynamics and substrate interactions.
  • Site-directed mutagenesis to assess the impact of disease-causing mutations.

Main Results:

  • Detailed atomic structures of several human HATs and homologous bacterial transporters have been resolved.
  • Key residues and structural features governing substrate specificity and binding asymmetry have been identified.
  • Specific mutations linked to diseases have been shown to disrupt transporter biogenesis, stability, or transport activity.

Conclusions:

  • Structural insights provide a mechanistic understanding of HAT function.
  • The findings highlight the critical role of HATs in health and disease.
  • This knowledge is foundational for developing therapeutic strategies targeting HATs in various pathologies.